Your PC is normal, 100%.
Mine GTX 770 hits 80C when gaming too.
My CPU hits 70C.
According to this guide : http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html
Your temps are totally normal.
"Here's the normal operating range for Core temperature:
80C Hot (100% Load)
70C Warm (Heavy Load)
50C Norm (Medium Load)
30C Cool (Idle)
Core temperatures in the mid 70's are safe."